Boruto and Mitsuki worry that their mission is in jeopardy, since Kokuri is scheduled to be transferred to Hozuki Castle II. They decide to escape with Kokuri before he's moved. As they discuss their strategy with Sarada, their cellmate Kedama overhears them
Then when the light from
that window goes on and off twice,
Okay, wenn ich also das Licht bei
einem Fenster zweimal an- und ausschalte,
Allora...
Então quando a luz daquela janela
acender e apagar duas vezes,
Тогда, когда свет 
в окне мелькнёт два раза,